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Abstract. This study aims to develop constructivism-based trigonometric modules that the aspects of validity, practicality and effectiveness. The product of this development is a constructivism-based trigonometric module. This module contains aspects related to constructivism-based trigonometric material for students. This type of research is development research. This study uses the Plomp model which consists of three phases, the preliminary research, prototyping phase, and assessment phase. The preliminary research phase needs analysis, analysis of student characteristics, curriculum analysis, concept analysis, and analysis of existing modules. The prototype phase, constructivism based trigonometric modules are designed, then formative evaluations are carried out to determine validity, and the practicality of the product in the form of modules. The assessment phase an assessment was carried out with practicality and effectiveness tests. Data effectiveness is obtained from problem solving abilities. The results showed that the trigonometric module developed was valid and practical. As well as mathematical problem solving capabilities are classified as effective based on KKM.